若xy=x+y,yz=2y+2z,xz=3x+3z,求x,y,z.
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分式题:xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz)xy=x+y,yz=2(y+z),zx=3(z+x),求xyz/(xy+yz+xz)
求证不等式 xyz[yz(y+z)+zx(z+x)+xy(x+y)]>=2(xy+yz+xz)^2
设x,y,z∈R+,xy+yz+xz=1,证明不等式:(xy)^2/z+(xz)^2/y+(yz)^2/x+6xyz≥x+y+zRt
若x-3=y-2=z-1,求x^+y^+z^-xy-yz-xz的值,若x-3=y-2=z-1,求x^+y^+z^-xy-yz-xz的值
(2X+Z-Y)/(X^2-XY+XZ-YZ)-(Y-Z)/(X^2-XY-XZ+YZ)
若x/2=1/y=z/3,且xy+xz+yz=99,求4x^2-2xz+3yz-9y^2的值.
x^2+y^2+xy=25/4,x^2+z^2+xz=169/4,y^2+z^2+yz=36,求xy+xz+yz
已知xy(x+y)^-1=1,yz(y+z)^-1=2,xz(z+x)^-1=3,试求xyz(xy+yz+xz)^-1的值
已知xy(x+y)^-1=1,yz(y+z)^-1=2,xz(z+x)^-1=3,试求xyz(xy+yz+xz)^-1的值
若实数xyz满足(x-2y+z)^2+4(x-y)(y-z)=0 A xy-yz=0 B xy+yz=0 C xy-xz=0 D xy+xz=0
若xyz+xy+yz+xz+x+y+z=2008,则x+y+z=多少,
化简(2x-y-z/x^2-xy-xz+yz)+(2y-x-z/y^2-xy-yz+xz)+(2x-x-y/z^2-xz-yz+xy)
2^x=5^y=10^z证明xy=xz=yz
2^x=5^y=10^z证明xy=xz+yz
x^2+y^2+z^2=2,xy+yz+xz的范围
x^2+y^2+z^2>=yz+xz+xy证明
xy/x+y=1,xz/x+z=2,yz/y+z=3,求x的值
如果1=xy/x+y,2=yz/y+z,3=xz/x+z,则x的值?